Which ZIP code in Frederick County has the highest median age?

21710 (Adamstown), at 51.9 (±3.3), among 26 ZIP codes with at least 1,000 residents.

Why are some ZIP codes missing?

ZIP codes with fewer than 1,000 residents are left out because their survey estimates swing too much to rank, and so are ZIP codes where the Census Bureau did not publish this figure.

Oldest ZIP codes in Frederick County, MD

These are the 25 ZIP codes in Frederick County with the highest median age, out of 26 with at least 1,000 residents. 21710 (Adamstown, 51.9), 20842 (Dickerson, 48.5) and 21788 (Thurmont, 44.6) lead the list. There is no single "best" ZIP code in Frederick County; the right one depends on who you want to reach, so the same ZIP codes are ranked several ways below.

Oldest ZIP codes in Frederick County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	21710	Adamstown	51.9 ±3.3	4,661	1,672	1,717
2	20842	Dickerson	48.5 ±5.4	2,369	802	753
3	21788	Thurmont	44.6 ±3.3	11,654	4,649	4,704
4	21776	New Windsor	44.1 ±6.5	6,261	2,346	2,091
5	21773	Myersville	43.8 ±3.0	5,826	1,997	1,935
6	21777	Point Of Rocks	43.8 ±7.7	2,462	817	624
7	21769	Middletown	43.3 ±2.6	11,965	4,146	4,409
8	21755	Jefferson	43.2 ±4.3	5,909	2,136	2,284
9	21793	Walkersville	42.8 ±0.9	10,719	3,890	3,825
10	21783	Smithsburg	42.8 ±3.8	9,910	3,632	3,304
11	21780	Sabillasville	41.5 ±6.6	2,159	781	670
12	21798	Woodsboro	41.3 ±4.4	2,928	929	914
13	21754	Ijamsville	41.2 ±2.7	8,156	2,660	2,604
14	21771	Mount Airy	40.9 ±1.7	33,031	11,226	11,089
15	21787	Taneytown	40.1 ±3.3	11,645	4,431	4,630
16	21770	Monrovia	39.8 ±2.4	8,751	2,622	2,971
17	21701	Frederick	39.6 ±1.1	43,048	18,651	20,269
18	21758	Knoxville	39.0 ±8.9	4,409	1,588	1,841
19	21704	Frederick	38.6 ±1.4	20,006	6,136	7,734
20	21716	Brunswick	38.5 ±2.4	7,200	2,924	3,371
21	21702	Frederick	38.1 ±1.0	49,605	18,525	19,996
22	21757	Keymar	37.8 ±5.3	2,671	1,018	1,097
23	21791	Union Bridge	37.7 ±4.9	5,340	1,968	1,829
24	21774	New Market	36.1 ±2.0	17,134	5,647	6,693
25	21703	Frederick	34.6 ±1.1	41,960	15,517	—

How we ranked them

Ranked by median age of all residents, highest first (ACS 5-year estimates, 2020–2024). ZIP codes need at least 1,000 residents to be ranked; 26 of 33 qualify.

Which of these to mail, and why

Older ZIP codes respond to health care, hearing and vision, Medicare plans, home safety, estate planning and services that come to the door.

The top five ZIP codes on this list hold 11,466 households, on 21 carrier routes with 11,200 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 21710 on the EDDM route map

More rankings

Businesses that mail these ZIP codes

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Frequently asked questions

Which ZIP code in Frederick County has the highest median age?: 21710 (Adamstown), at 51.9 (±3.3), among 26 ZIP codes with at least 1,000 residents.
How is this ranking calculated?: Ranked by median age of all residents, highest first (ACS 5-year estimates, 2020–2024).
Why are some ZIP codes missing?: ZIP codes with fewer than 1,000 residents are left out because their survey estimates swing too much to rank, and so are ZIP codes where the Census Bureau did not publish this figure.

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.